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Brown and Wilson (1959) summarize the genus as follows:
"Widespread in tropics and warm temperate areas. Primarily forest-dwelling; some species occur in grassland and arid scrub. ... Nests mostly in soil and rotting wood; a few species live in arboreal plant cavities in tropical rain forest. Foraging hypogaeic to epigaeic-arboreal. Food: most species are collembolan feeders; a few are polyphagous predators or occasionally feed on sugary substances..."
Members of the genus are all predaceous, with a kinetic mode of attack (Bolton 1999).
rogeri is native to Africa but has spread, along with human commerce, to many parts of the globe. It occurs in Hawaii, Fiji, greenhouses in England and Scotland, Florida, and many islands in the Caribbean. In the mainland Neotropics, I know of records from Guyana and the ones reported here for Costa Rica. Nests are in and under dead wood on the ground. Workers preferentially prey on entomobryoid Collembola and Campodeidae, but also take a variety of other small arthropods (Brown 1954).
At La Selva Biological Station, rogeri occurs in leaf litter deep within mature rainforest. Thus, it appears to be one of the few exotics that can invade mature forest, rather than being restricted to synanthropic habitats.
Bolton, B. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). J. Nat. Hist. 33:1639-1689.
Bolton, B. 2000. The ant tribe Dacetini, with a revision of the Strumigenys species of the Malagasy Region by Brian L. Fisher, and a revision of the Austral epopostrumiform genera by Steven O. Shattuck. Memoirs of the American Entomological Institute 65:1-1028.
Brown, W. L., Jr. 1954. The ant genus Strumigenys Fred. Smith in the Ethiopian and Malagasy regions. Bulletin of the Museum of Comparative Zoology 112:3-34.
Brown, W. L., Jr. 1962. The neotropical species of the ant genus Strumigenys Fr. Smith: Synopsis and keys to the species. Psyche 69:238-267.
Brown, W. L., Jr., Wilson, E. O. 1959. The evolution of the dacetine ants. Quarterly Review of Biology 34:278-294.
[[ worker ]] [[ queen ]].
[[ worker ]]. L. 1, 2 a 2 mill, (avec lea mandibules). Emery a decrit par erreur la dent inferieure de l'extremite des mandibules comme bifide, tandis qu'en realite elle est simple.
[[ queen ]]. L. 2, 3 mill. D'un jaune un peu roussatre, a peine plus fonce que chez l'ouvriere. Ailes subhyalines, assez pubescentes. Courte, epaisse. Scutellum tres eleve au dessus de la face basalo du metanotum et un peu proeminent. Metanotum avec deux larges et courtes epines. Du reste comme l'ouvriere.
(26 c). Fitz-Hugh Valley (leeward), 500 ft. Nov. 4 th. Shady place, under rubbish (variety?).
(26 d). Wallilobo Valley (leeward), 500 ft.. Nov. 8 th. Shady place, at the roots of plants growing on a damp rock. A single female referred to this species.
(26 e). Upper Richmond Valley, 1200 ft.; forest by stream. Jan. 18 th. Nest under a stone. About 150 ants in a single small chamber.
Found most commonly in these habitats: 36 times found in rainforest, 7 times found in montane rainforest, 17 times found in primary rainforest, 18 times found in forest, 18 times found in disturbed forest, 20 times found in lowland rainforest, 21 times found in mature wet forest, 11 times found in non native forest, 9 times found in littoral forest, 4 times found in littoral rainforest, ...
Found most commonly in these microhabitats: 43 times sifted litter (leaf mold, rotten wood), 48 times ex sifted leaf litter, 23 times ex rotten log, 17 times Hojarasca, 11 times under stone, 15 times ex rotten stick on ground, 13 times litter, 10 times sifted litter, 9 times litter, weeded, 8 times ex sifted litter, 7 times under rootmat, litter on rock, ...
Collected most commonly using these methods: 56 times Winkler, 19 times 9 MaxiWinks, mixed samples, 26 times MiniWinkler, 15 times Berlese, 3 times 4 MaxiWinks, mixed samples, 18 times Mini Winkler, 9 times MW 50 sample transect, 5m, 2 times 2 Maxi Winks, 7 times hand collection, 2 times Hand-Collected from 1 square meter of sifted leaf litter, 4 times search, ...
Elevations: collected from 1 - 1500 meters, 335 meters average